Switch port Mapper Question

Why would almost all my Cisco switches not show MAC address, IP address, or DNS information? All Enterasys switches show me the MAC address, IP address, and DNS information and they are setup the same way (correct SNMP and router is added). The Cisco switches do provide all the other fields (ifindex, ifName, IfDescr, IfType, IfSpeed, Status, Availability, and Vlan) and one or two ports (almost always trunk ports) will show all fields, but 95% of ports don't. All my other tools (CiscoWorks, Solarwinds Toolkit, etc...) show this information. The MAC address, IP address, and DNS information can be found with the MAC IP List tool so it was found somehow. Any assistance would be greatly appreciated.